Headphone



FIG. 1 is a top plan view of a headphone, showing our new design;

FIG. 2 is a left-side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof.

The ornamental design for a headphone, as shown and described. 